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Peterson Identification System
The Peterson Identification System is a practical method for the field identification of animals, plants and other natural phenomena. It was devised by ornithologist Roger Tory Peterson in 1934 for the first of his series of ''Field Guide''s〔Peterson, Roger Tory (1934), ''A Field Guide to the Birds'', Boston: Houghton Mifflin Company.〕 (See Peterson Field Guides.) Peterson devised his system "so that live birds could be identified readily at a distance by their 'field marks' without resorting to the bird-in-hand characters that the early collectors relied on. During the last half century the binocular and the spotting scope have replaced the shotgun."〔Peterson, Roger Tory (1980), ''A Field Guide to the Birds: A Completely New Guide to All the Birds of Eastern and Central North America'', Fourth Edition, Boston: Houghton Mifflin Company, pg 7.〕 As such, it both reflected and contributed to awareness of the emerging early environmental movement.
==The system==
Created for use by amateur naturalists and laymen, rather than specialists, the "Peterson System" is essentially a pictorial key based upon readily noticed visual impressions rather than on the technical features of interest to scientists. The technique involves patternistic drawings with arrows that pinpoint the key field comparisons between similar species.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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